Our floodplain development ordinance has standards and restrictions for construction and development in designated flood hazard areas in the city. Areas affected by the regulations are located within the designated floodplain along the:
Areas that Seattle Public Utilities has identified as having problem drainage are also regulated by our floodplain development ordinance.
If you are considering construction on property located in any of these areas, you should consult our regulations before starting the permit process. The King County Flooding Services and the FloodSmart.gov websites are also helpful resources.